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§ 20-12 MARTINSVILLE CODE struction and shall have smooth and easily cleanable surfaces. A white or light colored waterproof. interior finish, which will withstand repeated brushing, scr. ubbing and cleaning procedures, shall completely line the pool tothe coping. (Ord. of 5-10-77, § 5-1.513]) . . -i .. Sec. 20-13. Shape, contour, slope, etc. Swimming pools shall be designed and constructed of such shape and contour that efficient and safe control of the bathers can be accomplished. In water depths under five (5) feet, the slope of the bottom shall not exceed one foot in twelve (12) feet. Pool walls shall be vertical from the break point to the shallow end to within one foot of the finished floor of the pool. (Ord..of 5-10-77, § 9-1.514]) Sec. 20-14. Deck, (a) There shall be a deck at least four (4) feet wide extending around the entire perimeter of a swimming pool. The deck shall be constructed of concrete or other material having a nonslip but smooth finish. The deck shall have a pitch of not less than one-eighth of an inch nor more than five-eights of an inch to the foot and be so designed as to conduct drainage away from the pool area in a manner that will not create or maintain pools of water or create 'a health nuisance. (b) If the recirculation system is designed for water to enter the bottom portion of the pool and overflow the top, adequate drainage of the scum and floating material from the deck must be provided. This may be by a continuous drain or by multiple drains. In multiple drains, each drain grating shall have a total orifice area of at least four (4) times the cross-sectional area of the drain pipe, which shall have a minimum diameter of two and one-half (2V2) inches. In the use of drain channels, continuous around the perimeter of the pool, the channel grating shall be designed so as not to create a hazard to fingers and toes and shall be resistant to corrosion. (Ord. of 5-10-77, § 9-1.515], [7]) Sec. 20-15. Ladders and steps. Two (2) or more ladders shall be provided for all swimming pools that have a perimeter greater than one hundred (100) feet and one ladder shall be provided for pools having a perimeter of one hundred (100) feet or less. Steps below the water level projecting out into the pool are prohibited. Treads of all steps, ladders or other means shall be of nonslip construc- 'tion. Each recessed step area shall be provided with one or more handrails. (Ord. of 5-10-77, § 9-1.516]) Sec. 20-16. Overflow facilities. " (a) Provision shall be made for removal of floating material and scum from the surface of the water of a swimming pool. If a recessed typ.e of gutter located .near thet0p of the walls is to be used, the gutter shall have a minimum depth of three (3) inches and shall be of a design which will permit satisfactory cleaning of the overflow channel. The gutter~ drain outlets shall 1190